Nick, thank you. To syria tonight. The threat of chemical weapons appears to be growing. They may be in the hands of both sides. Alex marquardt got inside syria where he saw firsthand the suffering. He reports in from the turkish border. Alex? Reporter: Good evening, david. Today, one of america's closest allies, great britain, also said it had seen evidence that syria has prepared chemical weapons. So far, no proof has been offered publicly. At the same time, syria has said the rebels could use chemical weapons, racheting up the tension in this bloody conflict. Fighting has gripped the syrian capital, damascus. Rebels are trying to take the airport. Potentially huge logistical blow to the assad regime. American officials are scared a desperate assad could use chemical weapons. And said regime forces recently prepared components of sarin gas. Syria does not acknowledge having nerve agents. The forces are inflicting big losses on the disorganized rebel fighters. Several of whom we met yesterday inside syria, recovering battle in a makeshift hospital. They're young. This man is 17. Next to him, a 28-year-old father of three who lost his leg and finger in the fighting. But once recovered, he told us, he hopes to rejoin the fight with his prosthetic leg. The rebels are trying to organize themselves better in order to secure funding and weapons from the outside. Today, we learned a former army general has been elected the head of a new military council. Given the lack of coordination and organization until now, it remains very much to be seen whether a unified force can be created to bring down the assad regime.

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